linux-kernel - Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages

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Message-ID: <52FC98A6.1000701@linux.vnet.ibm.com>
Date:	Thu, 13 Feb 2014 15:34:22 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Damien Ramonda <damien.ramonda@...el.com>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local
 memory and limit readahead pages

On 02/13/2014 01:35 PM, David Rientjes wrote:
> On Thu, 13 Feb 2014, Raghavendra K T wrote:
>
>> I was able to test (1) implementation on the system where readahead problem
>> occurred. Unfortunately it did not help.
>>
>> Reason seem to be that CONFIG_HAVE_MEMORYLESS_NODES dependency of
>> numa_mem_id(). The PPC machine I am facing problem has topology like
>> this:
[...]
>>
>> So it seems numa_mem_id() does not help for all the configs..
>> Am I missing something ?
>>
>
> You need the patch from http://marc.info/?l=linux-mm&m=139093411119013
> first.

Thanks David, unfortunately even after applying that patch, I do not see
the improvement.

Interestingly numa_mem_id() seem to still return the value of a
memoryless node.
May be  per cpu _numa_mem_ values are not set properly. Need to dig out ....

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